BNWT Seirus Windproof Cold Weather Extreme Conditions Extreme Sports Sock Size Medium. Heat Trapping 4 Way Strech Breathable Macro-Porous Neoprene Black / Maroon. Great for Skiing* Snowboarding* Hiking* X-Country Skiing* Camping* Cycling* SnowMobiling* Nordic* Hunting* Fishing* Surfing Constructed With Seams Not Sealed.